Area Formulas - Math.com
http://www.math.com/tables/geometry/areas.htm
Area is measured in "square" units. The area of a figure is the number of squares required to cover it completely, like tiles on a floor. Area of a square = side times side. Since each side of a square is the same, it can simply be the length of one side squared. Square: A = a², where a is the side length Rectangle: A = a × b, where a and b are the side lengths Triangle: A = b × h / 2, where b is the base and h is the height Circle: A = πr², where r is the radius Ellipse: A = a × b × π, where a and b are the semi-major and semi-minor axes Trapezoid: A = (a + b) × h / 2, where a and b are the parallel sides and h is the height Parallelogram: A = b × h, where b is the base and h is the height Square area formula: A = a² Rectangle area formula: A = a × b Triangle area formulas: ... Circle area formula: A = πr²
Square: A = a², where a is the side length
Rectangle: A = a × b, where a and b are the side lengths
Triangle: A = b × h / 2, where b is the base and h is the height
Circle: A = πr², where r is the radius
Ellipse: A = a × b × π, where a and b are the semi-major and semi-minor axes
Trapezoid: A = (a + b) × h / 2, where a and b are the parallel sides and h is the height
Parallelogram: A = b × h, where b is the base and h is the height
Square area formula: A = a²
Rectangle area formula: A = a × b
Triangle area formulas: ...
Circle area formula: A = πr²
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